Question: Csc-blanc-spreadthesign.ogv has a  plagioclase label in sign language, what is the streak color?
Paraphrase: Csc-blanc-spreadthesign.ogv encompasses a plagioclase name in sign dialect, what is the streak color?
SPARQL (Wikidata): SELECT ?answer WHERE { wd:Q714830 wdt:P534 ?answer . ?answer wdt:P2919 ?x FILTER(contains(?x , 'Csc-blanc-spreadthesign.ogv'))}